Nov 5 1999
From The Space Library
NASA announced that its scientists had developed a new Digital Tectonic Activity Map (DTAM) of the Earth, pinpointing geologically and volcanically active features of the planet over the last 1 million years. Whereas most global geological maps were "plate maps," emphasizing the definition of plate boundaries of the planet's crust and current seismic or volcanic activity, the new tectonic map portrayed the broad architecture of Earth's crust, identifying all current and past geological activity. NASA had primarily generated the DTAM using publicly available data and commercial software, but had also used spacecraft data, including Landsat images, hand-held astronaut photography, and radar altimetry of sea-surface measurements gathered by NASA spacecraft .
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